GWS has slapped midfielder Toby Greene with a five-match internal suspension in the wake of an alleged assault at a bar that will see him face court later this year.

The Giants' official response to revelations on Tuesday that Greene had been hit with a slew of charges - intentionally causing serious injury, recklessly causing injury, affray, assault in company, assault by kicking, assault with a weapon, unlawful assault, making threats to inflict serious injury, being drunk in a public place, criminal damage - from an incident a night earlier in Melbourne came on Friday morning, with confirmation of its disciplinary action against the 20-year-old.

Toby Greene has been suspended for five matches over an alleged assault at a bar. Photo: Getty Images

The internal penalty, for drinking while injured and for failing for promptly notify the club of the incident, was formulated by the Giants leadership group and coach Leon Cameron, and then unanimously endorsed by the club's directors.

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Greene has also been fined $5000, the maximum allowed under rules agreed by the AFL, clubs and the AFL Players' Association.

GWS chief executive Dave Matthews stressed the club was "in no way pre-judging the charges against Toby which will be heard in court later this year".

Nevertheless, he said that Greene was drinking while injured and his failure to notify the club of what had occurred "within an acceptable time frame" warranted serious punishment.

"We are developing what we believe to be a strong culture at the Giants and we will not tolerate any actions by individuals which may jeopardise it," Matthews said.

"The player leadership group has made a clear statement to this effect and this has been supported by the board.

"Our values are paramount and we believe these are not only appropriate sanctions but also sends a strong message to our playing group, fans and corporate and community partners about what we stand for as a club.

"Toby will receive counselling to ensure he learns from this experience and the standards expected of all players. We have the youngest playing list in the AFL and we need to ensure we provide them appropriate support and education."

The Giants have decided Greene will be ineligible not only for senior selection during the five-week period but also for the reserves team in the NEAFL competition.

Greene will not be eligible to play at any level until the last weekend of June.

He and a friend were were granted bail after the charges, and are both due to face Melbourne Magistrates' Court on September 25.